Year	Percent
1960	-8.59167
1961	-6.48172
1962	-3.98872
1963	-7.43177
1964	-4.47006
1965	-3.79527
1966	-4.53505
1967	-2.01967
1968	0.60665
1969	-2.47163
1970	-5.798
1971	-6.4001
1972	-8.12272
1973	-6.62557
1974	-14.96235
1975	-11.84217
1976	-11.37165
1977	-6.40284
1978	-7.76752
1979	-13.96439
1980	-7.43932
1981	-9.14453
1982	-3.16561
1983	1.13996
1984	-2.86277
1985	-3.17516
1986	-3.10937
1987	-3.86337
1988	1.95298
1989	-5.08032
1990	-6.80696
1991	-11.54205
1992	-12.1658
1993	-11.5619
1994	-11.52492
1995	-13.21118
1996	-13.43277
1997	-11.36717
1998	-15.96275
1999	-12.97878
2000	-9.96778
2001	-5.82749
2002	-6.57224
2003	-6.0133
2004	-8.11726
2005	-6.69273
2006	-5.54879
2007	-6.65337
2008	-10.51981
2009	0.64746
2010	-8.18978
2011	-6.02679
2012	-7.67615
2013	-7.31065
2014	-8.37565
2015	-4.63214
2016	-4.52358